Tall shrub or clumped small tree to 10 m; winter-buds with 2–4 valvate scales; lvs 3-lobed or obscurely 5-lobed, softly hairy beneath, coarsely and irregularly serrate, the teeth 2–3 per cm, each tipped with a minute sharp gland; fls in fascicles of 2–4 along an erect axis, forming a slender, terminal, long-peduncled panicle 3–8 cm, long-pediceled, the terminal one of each fascicle usually perfect, the others sterile; pet greenish, very narrowly linear-oblanceolate, 3 mm, much exceeding the sep; disk extrastaminal; style barely notched; mericarps 1.8–2.5 cm, conspicuously reticulate over the seed, the wings diverging at about a right angle; 2n=26. Moist woods; Nf. to Sask., s. to Conn., Pa., O. and ne. Io., and in the mts. to N.C. and Tenn. June.
Can be grown by cuttings, graftings or seedlings. Seeds needs soaking.